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Answer:
C.How many cats are boarded?
Step-by-step explanation:
The answer to the Step 1 question is found in the last sentence of the problem statement:
"If there are 75 animals, how many cats are boarded?"
_____
Additional comment
If we let c represent the number of cats boarded, then the number of dogs is 2c+12, and the total number of animals is ...
c +(2c +12) = 75
3c = 63 . . . . . . . . . subtract 12
c = 21 . . . . . . . . . divide by 3
21 cats are boarded. (54 dogs are boarded)